A to Z Port Checker

A to Z Port Checker is a free online tool to find open ports in your system. This tool lets you scan open ports which may prove security holes to hackers. You can also test whether port forwarding is working or not.

Ports 1024 to 49151 - Registered ports; meaning they can be registered to specific protocols by software corporations.

Ports 49152 to 65536 - Dynamic or private ports; meaning that they can be used by just about anybody.

What is Port Forwarding?

Port Forwarding is a special function on the router, allowing transfer of data packets from the outside (from the Internet) to devices or computers on your local network (LAN). Usually the port on your router will be closed to prevent hackers on your system. But when you use the service to connect through port on the router you need to open it. For example: Yahoo! Messenger you need one of the following ports must be open: 5061, 443, 80.